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10903 Views 6 Replies Latest reply: Jun 16, 2009 7:43 AM by MattHagen
Currently Being ModeratedApr 7, 2009 12:58 PM (in response to CANT RESTORE IPHONE ERROR 21)Hi,
Try the general restore troubleshooting tips in this article: http://support.apple.com/kb/TS1275
Make sure the iPhone is directly connected to a high-speed USB2 port on the Mac, using the cable that came with it.
-JasonMBP 2.4 with 4GB ram, Mac OS X (10.5.6), Original iPhone, iPhone 3G, Apple TV, Airport, iMac, iPod Video, Nano, Hi-Fi..
Currently Being ModeratedJun 7, 2009 2:09 PM (in response to Jason L)Tried all the tricks on two different Macs (with two different Apple-brand USB cables). Keep getting stuck after confirming the Restore process with error 21. Help?too many to count, Mac OS X (10.5)
Currently Being ModeratedJun 7, 2009 3:24 PM (in response to CANT RESTORE IPHONE ERROR 21)
CANT RESTORE IPHONE ERROR 21 wrote:
hi. When i try to restore my iPhone, it says "Cannot restore unknown error 21"
Have you tried restoring the iphone in DFU Mode?
Step 1. Turn off your iPhone.
Step 2. Hold down the power and home button.
Step 3. When you see the Apple logo, release the power button but continue holding the home button down.
Step 4. Open iTunes and wait for it to tell you that its in restore mode.
Step 1. Connect iphone to USB then listen to the sound when it connect and disconnect.
Step 2. Hold the home and power buttons until hear the disconnect sound then release power button.
Step 3. Wait until you hear another sound then release home button.MAcbook, Mac OS X (10.5.6), 4gb Ram 120 gb HDD Iphone 1 and 2
Currently Being ModeratedJun 16, 2009 7:43 AM (in response to clarkkent27)Funny - I have exactly the same problem.
I was having problems with the earphones and tried to use the "RESTORE" button on iTunes (8.2) to fix it. It hung while contacting Apple, and now the phone is stuck in restore mode but won't complete the restore process, giving an Error 21 each time.
DFU mode doesn't work, and neither did the Geniuses. Their advice: buy a new one.MacBook Pro Core 2 Duo, Mac OS X (10.5.7), 1st Generation iPhone, 8 GB model